EP0900932B1 - Fuel injection system for an internal combustion engine - Google Patents

Fuel injection system for an internal combustion engine Download PDF

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Publication number
EP0900932B1
EP0900932B1 EP98110449A EP98110449A EP0900932B1 EP 0900932 B1 EP0900932 B1 EP 0900932B1 EP 98110449 A EP98110449 A EP 98110449A EP 98110449 A EP98110449 A EP 98110449A EP 0900932 B1 EP0900932 B1 EP 0900932B1
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EP
European Patent Office
Prior art keywords
fuel
additional liquid
pressure
fuel injection
valve
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Expired - Lifetime
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EP98110449A
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German (de)
French (fr)
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EP0900932A1 (en
Inventor
Hermann Grieshaber
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0003—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure
    • F02M63/0007—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure using electrically actuated valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M43/00—Fuel-injection apparatus operating simultaneously on two or more fuels, or on a liquid fuel and another liquid, e.g. the other liquid being an anti-knock additive
    • F02M43/04—Injectors peculiar thereto
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0047—Four-way valves or valves with more than four ways
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0049—Combined valve units, e.g. for controlling pumping chamber and injection valve

Definitions

  • the invention relates to a fuel injection system for Internal combustion engines according to the preamble of claim 1 out.
  • a high-pressure feed pump fills the fuel injection system a high pressure accumulator with fuel from a storage tank. Pressure lines run from the high-pressure accumulator (common rail) to the individual injection nozzles of the internal combustion engine.
  • Fuel diesel fuel
  • An additional liquid the nitrogen oxide and soot emissions of the internal combustion engine lowered. This type of injection also affects a reduction in fuel consumption. Water is generally used as the additional liquid.
  • the internal combustion engine must have a dynamic water content can be quickly reduced or switched off. Otherwise increased the HC emission.
  • the high injection pressure is in the injector is permanently present. Therefore, in the known Fuel injection system provided for relief the storage of additional liquid in the pressure chamber Relieve pressure within the pressure chamber for a short time. This is done by a 3/2-way valve, so that fuel from the Pressure chamber pushed out by the penetrating additional liquid can be.
  • the 3/2-way valve opens during the injection break the passage to a drain line for the Pressure reduction and return of the fuel from the injection nozzle in a storage container.
  • the inflow closed by the commom rail pressure accumulator Parallel to this Valve control is provided by another check valve an opening for the feed of additional liquid (water) Approved.
  • the additional liquid is in the area of the nozzle tip fed to the injector.
  • the check valve is held in an open position until the desired one Amount of additional liquid upstream in the pressure chamber is.
  • the admixture of fuel and additional liquid in the Print room requires precise and fast control of the Valve assembly. For example, depending on the operating state the internal combustion engine the amount of fuel or additional liquid can be varied from work cycle to work cycle can.
  • the Changeover valve for fuel storage is a 3/2-way valve trained while additionally a separate check valve for the storage of additional liquid in the Pressure room becomes necessary.
  • This fuel injection system has only one Switch valve to switch between the liquid lines for fuel and additional liquid or for pressure relief of the pressure chamber to be able to switch.
  • a single valve as a control valve can be rapid changes in the storage of fuel or additional liquid lead into the pressure room. Through the control a single valve can be the valve assembly be switched more precisely and faster.
  • a multi-way solenoid valve can be used.
  • a multi-way valve either the two pressure relief openings Pressure chamber or the opening to the common rail high-pressure accumulator be released.
  • the exemplary embodiment of a fuel injection system with an injector 10 according to FIG. 1 is in a state in which additional liquid is stored in a pressure chamber 11 of a two-component injection nozzle 12.
  • a changeover valve 16 with a Valve housings 17 Due to the position of a changeover valve 16 with a Valve housings 17 are the pressure chamber 11 and a feed line 18 for fuel of the two-component injector 12 largely depressurized.
  • the feed line 18 is via a return line 19 connected to a fuel tank.
  • a decoupling throttle 20 is installed.
  • the changeover valve 16 has a first valve opening 21 and a second valve opening 22.
  • the first valve opening 21 connects the feed line 18 to the fuel tank.
  • the second valve opening 22 allows additional liquid from an auxiliary liquid container 23 with the help a feed pump 24 in the pressure chamber 11 of the two-substance injector 12 to be stored.
  • a connecting line 25 is switched continuously with an additional liquid line 26.
  • a fuel supply line 27, however, is from the fuel line 28 separated.
  • the fuel line 28 can fuel from a common rail pressure accumulator 29 forward.
  • Pressure regulator 30 and filter 31 ensure one controlled and defined supply of additional liquid from the additional liquid container 23.
  • the fuel injection system with an injector 10 is in a state in which fuel and stored additional liquid are injected from the two-substance injection nozzle 12 from the pressure chamber 11 into a combustion chamber of the internal combustion engine 32.
  • the internal combustion engine 32 is again only in FIG indicated and shown with their edge area.
  • the position of the changeover valve 16 gives the first Valve opening 21 gives access to the common rail pressure accumulator 29 free.
  • the return line 19 is through the valve position of the changeover valve 16 separated from the supply line 18.
  • the additional liquid line 25 also has none Passage to makeup liquid line 26. Hence, no additional liquid from the additional liquid container 23 get into the pressure chamber 11.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Description

Stand der TechnikState of the art

Die Erfindung geht von einer Kraftstoffeinspritzanlage für Brennkraftmaschinen nach der Gattung des Patentanspruchs 1 aus.The invention relates to a fuel injection system for Internal combustion engines according to the preamble of claim 1 out.

Bei einer derartigen aus der DE 43 37 048 C2 bekannten Kraftstoffeinspritzanlage füllt eine Hochdruckförderpumpe einen Hochdruckspeicher mit Kraftstoff aus einem Vorratstank. Vom Hochdruckspeicher (Common-Rail) führen Druckleitungen zu den einzelnen Einspritzdüsen der Brennkraftmaschine. Durch eine nacheinander durchführbare Einspritzung von Kraftstoff (Diesel-Kraftstoff) und einer Zusatzflüssigkeit wird die Stickoxid und Rußemission der Brennkraftmaschine gesenkt. Diese Art der Einspritzung wirkt sich auch hinsichtlich einer Reduzierung des Kraftstoffverbrauchs aus. Als Zusatzflüssigkeit wird in der Regel Wasser verwendet.In such a known from DE 43 37 048 C2 A high-pressure feed pump fills the fuel injection system a high pressure accumulator with fuel from a storage tank. Pressure lines run from the high-pressure accumulator (common rail) to the individual injection nozzles of the internal combustion engine. Through a sequential injection of Fuel (diesel fuel) and an additional liquid the nitrogen oxide and soot emissions of the internal combustion engine lowered. This type of injection also affects a reduction in fuel consumption. Water is generally used as the additional liquid.

Bei niedrigem Lastbetrieb der Brennkraftmaschine oder kalter Brennkraftmaschine muß jedoch der Wasseranteil dynamisch schnell vermindert oder abgeschaltet werden. Ansonsten erhöht sich die HC-Emission.At low load operation of the internal combustion engine or colder However, the internal combustion engine must have a dynamic water content can be quickly reduced or switched off. Otherwise increased the HC emission.

Bei einem Common-Rail-System ist der hohe Einspritzdruck in der Einspritzdüse permanent vorhanden. Daher ist bei der bekannten Kraftstoffeinspritzanlage vorgesehen, zur Erleichterung der Vorlagerung von Zusatzflüssigkeit im Druckraum den Druck innerhalb des Druckraums kurzzeitig abzubauen. Dies erfolgt durch ein 3/2-Wegeventil, so daß Kraftstoff aus dem Druckraum durch die eindringende Zusatzflüssigkeit herausgedrängt werden kann. Das 3/2-Wegeventil öffnet in der Einspritzpause den Durchgang zu einer Ablaufleitung für den Druckabbau und Rücklauf des Brennstoffs aus der Einspritzdüse in einen Vorratsbehälter. Gleichzeitig wird der Zulauf vom Commom-Rail-Druckspeicher geschlossen. Parallel zu dieser Ventilsteuerung wird durch ein weiteres Rückschlagventil eine Öffnung für den Zulauf der Zusatzflüssigkeit (Wasser) freigegeben. Die Zusatzflüssigkeit wird im Bereich der Düsenspitze der Einspritzdüse zugeführt. Das Rückschlagventil wird solange in einer offenen Stellung gehalten, bis die gewünschte Menge an Zusatzflüssigkeit in den Druckraum vorgelagert ist.In a common rail system, the high injection pressure is in the injector is permanently present. Therefore, in the known Fuel injection system provided for relief the storage of additional liquid in the pressure chamber Relieve pressure within the pressure chamber for a short time. This is done by a 3/2-way valve, so that fuel from the Pressure chamber pushed out by the penetrating additional liquid can be. The 3/2-way valve opens during the injection break the passage to a drain line for the Pressure reduction and return of the fuel from the injection nozzle in a storage container. At the same time, the inflow closed by the commom rail pressure accumulator. Parallel to this Valve control is provided by another check valve an opening for the feed of additional liquid (water) Approved. The additional liquid is in the area of the nozzle tip fed to the injector. The check valve is held in an open position until the desired one Amount of additional liquid upstream in the pressure chamber is.

Wenn das Rückschlagventil wieder geschlossen ist, wird das 3/2-Wegeventil wieder in die Einspritzstellung für Kraftstoff umgeschaltet. Anschließend kann wieder Kraftstoff in den Druckraum mit Hochdruck eindringen. Die Verbindung zum Common-Rail-Druckspeicher ist dabei wieder durchgängig eingerichtet. Die Einlagerung von Kraftstoff und Zusatzflüssigkeit im Druckraum erfolgt schichtweise. Wenn Zusatzflüssigkeit in den Druckraum vorgelagert wird, verbleibt unterhalb der Einlaßöffnung für die Zusatzflüssigkeit trotzdem ein Rest an Kraftstoff. Die Zusatzflüssigkeit bildet nach dem Einlaß eine Schicht über dem Kraftstoff. Danach wird wieder Kraftstoff in den Druckraum befördert, der sich über der Zusatzflüssigkeitsschicht anlagert. Beim Beginn der Einspritzung wird folglich zunächst eine kleine Menge reinen Kraftstoffs eingespritzt. Aus diesem Grund erhält man einen kurzen Zündverzug. Anschließend wird sämtliche eingelagerte Zusatzflüssigkeit eingespritzt. Die Zumessung der Zusatzflüssigkeit durch die Ansteuerung der Ventilanordnung muß so erfolgen, daß keine Restzusatzflüssigkeit im Druckraum verbleibt. Bei Lasten von Null bis ca. 20 % (max. 40 %) Vollast schaltet man die Einlagerung von Zusatzflüssigkeit ab und spritzt reinen Kraftstoff ein. Bei Lasten unter ca. 20 % und noch nicht betriebswarmen Brennkraftmaschinen wird keine Zusatzflüssigkeit vorgelagert.When the check valve is closed again, it will 3/2-way valve back in the fuel injection position switched. Then fuel can come back in penetrate the pressure chamber with high pressure. The connection to Common rail pressure accumulator is again set up consistently. The storage of fuel and additional liquid takes place in layers in the pressure chamber. If additional liquid upstream in the pressure chamber remains below the inlet opening for the additional liquid Rest of fuel. The additional liquid forms after Intake a layer over the fuel. After that, again Fuel transported into the pressure chamber, which is above the additional liquid layer attaches. At the beginning of the injection will therefore initially use a small amount of pure fuel injected. For this reason you get a short one Ignition delay. Then all the stored additional liquid injected. The metering of the additional liquid by controlling the valve arrangement, that no residual liquid remains in the pressure chamber. At loads from zero to approx. 20% (max. 40%) full load you switch off the storage of additional liquid and injects pure fuel. At loads below approx. 20% and Internal combustion engines that are not yet at operating temperature will not become an additional liquid upstream.

Die Zumischung von Kraftstoff und Zusatzflüssigkeit im Druckraum erfordert eine präzise und schnelle Steuerung der Ventilanordnung. Beispielsweise muß je nach Betriebszustand der Brennkraftmaschine die Menge an Kraftstoff bzw. Zusatzflüssigkeit von Arbeitsspiel zu Arbeitsspiel variiert werden können.The admixture of fuel and additional liquid in the Print room requires precise and fast control of the Valve assembly. For example, depending on the operating state the internal combustion engine the amount of fuel or additional liquid can be varied from work cycle to work cycle can.

Bei der bekannten Kraftstoffeinspritzanlage sind zum Einfüllen von Kraftstoff und Zusatzflüssigkeit in den Druckraum zwei voneinander getrennte Umschaltventile vorgesehen. Das Umschaltventil für die Kraftstoffeinlagerung ist als 3/2-Wegeventil ausgebildet, während zusätzlich ein separates Rückschlagventil zur Einlagerung von Zusatzflüssigkeit in den Druckraum notwendig wird.In the known fuel injection system are for filling of fuel and additional liquid in the pressure chamber two separate switching valves are provided. The Changeover valve for fuel storage is a 3/2-way valve trained while additionally a separate check valve for the storage of additional liquid in the Pressure room becomes necessary.

Für eine abwechselnde Befüllung des Druckraums müssen beide Ventile miteinander koordiniert und in Abhängigkeit von einander angesteuert werden. Dies erfordert noch zusätzliche Steuereinrichtungen. Die Abstimmung der Ventilansteuerung durch die Ausbildung einer aufwendigen Elektronik verteuert daher die Brennkrafteinspritzanlage und wirkt sich auch nachteilig auf den Wartungsaufwand und die Wartungskosten aus.For an alternating filling of the pressure chamber, both must Valves coordinated with each other and interdependent can be controlled. This requires additional Control devices. The coordination of the valve control made expensive by the formation of elaborate electronics hence the fuel injection system and also has an effect disadvantageous to the maintenance effort and the maintenance costs out.

Durch den Einsatz der kompliziert aufgebauten Kraftstoffeinspritzanlage aus mehreren einzelnen Bauteilen erhöht sich auch die Störanfälligkeit. By using the complicated fuel injection system from several individual components increases also the susceptibility to failure.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Kraftstoffeinspritzanlage weist zur Verbesserung und Vereinfachung der Ventilansteuerung für Kraftstoff und Zusatzflüssigkeit die Merkmale des Patentanspruchs 1 auf.The fuel injection system according to the invention Improvement and simplification of valve control for Fuel and additive characteristics of claim 1.

Diese Kraftstoffeinspritzanlage besitzt lediglich ein einziges Umschaltventil, um zwischen den Flüssigkeitsleitungen für Kraftstoff und Zusatzflüssigkeit bzw. für eine Druckentlastung des Druckraums umschalten zu können. Durch die Handhabung eines einzigen Ventils als Steuerventil lassen sich schnelle Änderungen der Einlagerung von Kraftstoff oder Zusatzflüssigkeit in den Druckraum durchführen. Durch die Ansteuerung eines einzigen Ventils kann die Ventilanordnung präziser und schneller geschaltet werden.This fuel injection system has only one Switch valve to switch between the liquid lines for fuel and additional liquid or for pressure relief of the pressure chamber to be able to switch. By handling a single valve as a control valve can be rapid changes in the storage of fuel or additional liquid lead into the pressure room. Through the control a single valve can be the valve assembly be switched more precisely and faster.

Die Verringerung der Anzahl der Bauteile der Ventilanordnung der Kraftstoffeinspritzanlage hat den weiteren Vorteil, daß bei der Wartung der Kraftstoffeinspritzanlage nur die Funktionsweise eines Ventils und keine größere Anzahl getrennter Ventile kontrolliert und gegebenenfalls nachgearbeitet werden muß. Es muß hier berücksichtigt werden, daß in einer Brennkraftanlage eine Vielzahl an Einspritzdüsen existieren kann. Die Bauteilreduzierung wirkt sich auch positiv auf eine mögliche Störanfälligkeit der Ventilanordnung aus, da die Gefahrenquelle durch mehrere kompliziert aufgebaute und anfällige Bauteile reduziert ist.Reducing the number of components of the valve assembly the fuel injection system has the further advantage that only the functionality when servicing the fuel injection system of a valve and no large number of separate Valves are checked and reworked if necessary got to. It must be taken into account here that in a Internal combustion engine a variety of injectors exist can. The component reduction also has a positive effect on one possible susceptibility to failure of the valve arrangement from the Source of danger from several complex and vulnerable Components is reduced.

Als Umschaltventil kann auf bekannte Techniken zurückgegriffen werden. Insbesondere läßt sich ein Mehrwege-Magnetventil einsetzen. Beispielsweise können durch ein derartiges Mehrwegeventil entweder die beiden Öffnungen zur Druckentlastung des Druckraums oder die Öffnung zum common-Rail-Hochdruckspeicher freigegeben werden.Known techniques can be used as a changeover valve become. In particular, a multi-way solenoid valve can be used. For example, such a multi-way valve either the two pressure relief openings Pressure chamber or the opening to the common rail high-pressure accumulator be released.

Weitere Vorteile und vorteilhafte Ausgestaltungen des Gegenstands der Erfindung sind in der Beschreibung, der Zeichnung und in den Ansprüchen entnehmbar.Further advantages and advantageous configurations of the object the invention are in the description, the drawing and removable in the claims.

Zeichnungdrawing

Ein Ausführungsbeispiel der erfindungsgemäßen Kraftstoffeinspritzanlage für eine Brennkraftmaschine ist in der Zeichnung dargestellt und wird in der nachfolgenden Beschreibung erläutert.An embodiment of the fuel injection system according to the invention for an internal combustion engine is in the drawing shown and is in the description below explained.

Es zeigen:

Fig. 1
ein Ausführungsbeispiel in einer schematischen Darstellung, beim dem über das erfindungsgemäße Umschaltventil Zusatzflüssigkeit in den Druckraum der Einspritzdüse eingelagert wird und
Fig. 2
den Zustand des Ausführungsbeispiel nach Fig. 1, bei dem die Zuführleitung für Zusatzflüssigkeit geschlossen ist und Kraftstoff in den Druckraum eingeleitet wird.
Show it:
Fig. 1
an embodiment in a schematic representation, in which additional liquid is stored in the pressure chamber of the injection nozzle via the switching valve according to the invention and
Fig. 2
the state of the embodiment of FIG. 1, in which the supply line for additional liquid is closed and fuel is introduced into the pressure chamber.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Das Ausführungsbeispiel einer Kraftstoffeinspritzanlage mit einem Injektor 10 nach Fig. 1 befindet sich in einem Zustand, bei dem Zusatzflüssigkeit in einen Druckraum 11 einer Zweistoff-Einspritzdüse 12 eingelagert wird.The exemplary embodiment of a fuel injection system with an injector 10 according to FIG. 1 is in a state in which additional liquid is stored in a pressure chamber 11 of a two-component injection nozzle 12.

Durch Schließen eines Elektro-Magnetventils 13 wird durch Druck einer Feder eine Düsennadel 14 auf einen Ventilsitz 15 gedrückt. Aus der Zweistoff-Einspritzdüse 12 kann folglich weder Kraftstoff noch Zusatzflüssigkeit eingespritzt werden.By closing an electro-magnetic valve 13 is by Pressure of a spring, a nozzle needle 14 on a valve seat 15 pressed. From the two-substance injector 12 can consequently neither fuel nor additional liquid are injected.

Aufgrund der Stellung eines Umschaltventils 16 mit einem Ventilgehäuse 17 sind der Druckraum 11 und eine Zuleitung 18 für Kraftstoff der Zweistoff-Einspritzdüse 12 weitgehend druckentlastet. Die Zuleitung 18 ist über eine Rücklaufleitung 19 mit einem Brennkraftstoffbehältnis verbunden. In die Rücklaufleitung 19 ist eine Abkoppelungs-Drossel 20 eingebaut. Das Umschaltventil 16 besitzt eine erste Ventilöffnung 21 und eine zweite Ventilöffnung 22. Die erste Ventilöffnung 21 verbindet die Zuleitung 18 mit dem Brennkraftstoffbehältnis. Die zweite Ventilöffnung 22 ermöglicht es, Zusatzflüssigkeit aus einem Zusatzflüssigkeitsbehälter 23 mit Hilfe einer Förderpumpe 24 in den Druckraum 11 der Zweistoff-Einspritzdüse 12 einzulagern. Eine Verbindungsleitung 25 ist dabei mit einer Zusatzflüssigkeitsleitung 26 durchgehend geschaltet. Eine Kraftstoffzuführleitung 27 ist dagegen von der Kraftstoffleitung 28 abgetrennt. Die Kraftstoffleitung 28 kann Kraftstoff aus einem Common-Rail-Druckspeicher 29 zuleiten. Druckregler 30 und Filter 31 gewährleisten eine kontrollierte und definierte Zufuhr von Zusatzflüssigkeit aus dem Zusatzflüssigkeitsbehälter 23. Due to the position of a changeover valve 16 with a Valve housings 17 are the pressure chamber 11 and a feed line 18 for fuel of the two-component injector 12 largely depressurized. The feed line 18 is via a return line 19 connected to a fuel tank. In the Return line 19, a decoupling throttle 20 is installed. The changeover valve 16 has a first valve opening 21 and a second valve opening 22. The first valve opening 21 connects the feed line 18 to the fuel tank. The second valve opening 22 allows additional liquid from an auxiliary liquid container 23 with the help a feed pump 24 in the pressure chamber 11 of the two-substance injector 12 to be stored. A connecting line 25 is switched continuously with an additional liquid line 26. A fuel supply line 27, however, is from the fuel line 28 separated. The fuel line 28 can fuel from a common rail pressure accumulator 29 forward. Pressure regulator 30 and filter 31 ensure one controlled and defined supply of additional liquid from the additional liquid container 23.

Die eigentliche Brennkraftmaschine ist in der Figur nur angedeutet und mit der Bezugsziffer 32 bezeichnet.The actual internal combustion engine is only hinted at in the figure and designated by the reference number 32.

Gemäß Fig. 2 befindet sich die Kraftstoffeinspritzanlage mit einem Injektor 10 in einem Zustand, bei dem Kraftstoff und eingelagerte Zusatzflüssigkeit von der Zweistoff-Einspritzdüse 12 aus dem Druckraum 11 in einen Brennraum der Brennkraftmaschine 32 eingespritzt wird. 2 , the fuel injection system with an injector 10 is in a state in which fuel and stored additional liquid are injected from the two-substance injection nozzle 12 from the pressure chamber 11 into a combustion chamber of the internal combustion engine 32.

Die Brennkraftmaschine 32 ist in der Figur 2 wiederum nur angedeutet und mit ihrem Randbereich dargestellt.The internal combustion engine 32 is again only in FIG indicated and shown with their edge area.

Durch Betätigung des Magnetventils 13 ist die Düsennadel 14 von dem Ventilsitz 15 beabstandet. Die Zuleitung 18 ist über die Kraftstoffzuführleitung 27 mit der Kraftstoffleitung 28 verbunden.By actuating the solenoid valve 13, the nozzle needle 14 spaced from the valve seat 15. The feed line 18 is over the fuel supply line 27 with the fuel line 28 connected.

Durch die Stellung des Umschaltventils 16 gibt die erste Ventilöffnung 21 den Zugang zum Common-Rail-Druckspeicher 29 frei. Dagegen ist die Rücklaufleitung 19 durch die Ventilstellung des Umschaltventils 16 von der Zuleitung 18 abgetrennt. Auch die Zusatzflüssigkeitsleitung 25 besitzt keinen Durchgang zur Zusatzflüssigkeitsleitung 26. Folglich kann keine Zusatzflüssigkeit aus dem Zusatzflüssigkeitsbehälter 23 in den Druckraum 11 gelangen.The position of the changeover valve 16 gives the first Valve opening 21 gives access to the common rail pressure accumulator 29 free. In contrast, the return line 19 is through the valve position of the changeover valve 16 separated from the supply line 18. The additional liquid line 25 also has none Passage to makeup liquid line 26. Hence, no additional liquid from the additional liquid container 23 get into the pressure chamber 11.

Durch die Anordnung von Bohrungsöffnungen 33, 34 und 35 werden Kraftstoff und Zusatzflüssigkeit "schichtweise" in den Druckraum eingelagert. Nach Abschalten der Brennkraftstoffzufuhr und beim Einlagern von Zusatzflüssigkeit in den Druckraum 11 verbleibt ein Rest an Kraftstoff unterhalb der Bohrungsöffnung 33. Darüber lagert sich die eindringende Zusatzflüssigkeit an. Deshalb wird immer zuerst ein Rest an Kraftstoff eingespritzt.The arrangement of bore openings 33, 34 and 35 Fuel and additional liquid "in layers" in the Pressure room stored. After switching off the fuel supply and when storing additional liquid in the A space of fuel remains below the pressure chamber 11 Bore opening 33. The penetrating additional liquid is deposited above it on. Therefore, a rest is always added first Injected fuel.

Claims (3)

  1. Fuel injection system for an internal combustion engine, with a dual-fuel injection nozzle (12), in the pressure space (11) of which fuel and an additional liquid can be conveyed alternately, and with a valve arrangement, by means of which the high-pressure-side supply of fuel to the dual-fuel injection nozzle (12) and the connection of the pressure space (11) to a low-pressure side and to a supply line (26) for the additional liquid can be controlled, characterized in that the fuel injection system possesses only a single changeover valve (16) which is designed both for activating the action of high or low pressure upon the pressure space (11) and for activating the filling of the pressure space (11) with the additional liquid.
  2. Fuel injection system according to Claim 1, characterized in that the changeover valve (16) is a multi-way solenoid valve.
  3. Fuel injection system according to Claim 1 or 2, characterized in that the changeover valve (16) is installed in the fuel high-pressure connection between a common-rail pressure accumulator (29) and the pressure space (11).
EP98110449A 1997-09-03 1998-06-08 Fuel injection system for an internal combustion engine Expired - Lifetime EP0900932B1 (en)

Applications Claiming Priority (2)

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DE19738397A DE19738397A1 (en) 1997-09-03 1997-09-03 Fuel injection system for an internal combustion engine
DE19738397 1997-09-03

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EP0900932A1 EP0900932A1 (en) 1999-03-10
EP0900932B1 true EP0900932B1 (en) 2002-09-11

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EP (1) EP0900932B1 (en)
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DE (2) DE19738397A1 (en)

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Publication number Publication date
DE59805489D1 (en) 2002-10-17
EP0900932A1 (en) 1999-03-10
DE19738397A1 (en) 1999-03-18
JPH11148436A (en) 1999-06-02
US5979410A (en) 1999-11-09

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